I always carry a full spare fuel line with connectors and primer bulb. And something new to my kit will be hull plugs, took them out to drain any water in the hull and the fish hatches and left them on the boat. After the drive back to camp realized the mistake and luck was on my side and found them all but could have ruined my trip

I have a large list but then I travel far and a bit of extra weight on 2,5t does not hurt me too much:Spare engine oil (Plenty in sealed 500ml containers) as easier to handle at sea if you need and less open leaky containers left lying about.Fuel filers and spare plugsStrap wrench (to get the pesky filters off) - screw driver through the filter will get you shot!Socket setPliers, side cutters and leatherman and side cutters,Spare 3mm sq 12VDC wire,Spare fuel hose and 2 spare prime pump bulbsJumper cables (I have 2 X 180amp deep cycle no Maint gel batteries on either side of the boat - make sure your cables are long enough - my first set were not!)Screw drivers assortedCable ties - Plenty of as the can double up as fuel hose clamps in a pinch and much more.zip lock bags (extras as all the above gets stored in ziplocks where possible)Small tub of common sizes SS screws, nuts and bolts) GREASE - a big must!!and a universal tool (tacknometer - or better known as a hammer)Hacksaw and blades,Tin of GP spray - Q20 or similarSpare batteries, torch, cylumes... over and above that in the capsize bottle as I go out at night a lot,Spare bulbs for my nave lightsDemolitions tape or gaffer tapeI keep the stuff all readily available and easily accessible and if I use any at sea replace it immediately and consider it a bad day at sea as Maintenance should have picked it up or prevented it if possible!